Self-correcting current transformer system
US9466417B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 29, 2014 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Dec 28, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F38/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A self-correcting current transformer 100 combines a current transformer 113 and self-calibration electronics 115 into one device. The current transformer has a sensor coil 106 with a number of turns that is less than a target number of turns, to cause a secondary current 205 induced in the sensor coil to be greater than a target secondary current 404 corresponding to the target number of turns. A measurement circuit 116 integrated with the transformer, determines an error signal 214 representing how much greater the secondary current is than the target secondary current and outputs the error signal. A current sink circuit 129 integrated with the transformer, shunts an amount of current 216 from the sensor coil, based on the error signal, to reduce a magnitude of the secondary current to match the target secondary current. The measurement circuit and the current sink circuit may be powered by the secondary current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.